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Pregnancy rates in mares inseminated with 0.5 or 1 million sperm using hysteroscopic or transrectally guided deep-horn insemination techniques.
MedLine Citation:
PMID:  22704389     Owner:  NLM     Status:  Publisher    
Placement of sperm deep in the equine uterine horn allows fewer sperm to be inseminated while maintaining acceptable fertility, and has been promoted for use in circumstances when fertility would be expected to be low if standard insemination were used (e.g., semen from a subfertile stallion, or frozen-thawed semen). Two main techniques, transrectally guided (TRG) and hysteroscopic (HYS) insemination, have been developed for this purpose; however, there is some controversy regarding their comparative efficacy. This study was conducted to compare pregnancy rates when mares were inseminated by TRG or HYS, using sperm numbers approaching and under the minimum threshold, resulting in reduced fertility. When 1 × 10(6) sperm were inseminated, pregnancy rates were not different (P > 0.10) between techniques HYS (10/13, 77%) and TRG (11/15, 73%). Similarly, when 0.5 × 10(6) sperm were inseminated, pregnancy rates were not different (P > 0.10) between techniques HYS (3/15, 20%) and TRG (4/13, 31%). Combined pregnancy rates for the two treatments were 13/28 (46%) for HYS and 15/28 (54%) for TRG (P > 0.10). Pregnancy rates using a subthreshold number of sperm were not significantly affected by a deep-horn insemination technique.
S S Hayden; T L Blanchard; S P Brinsko; D D Varner; K Hinrichs; C C Love
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-13
Journal Detail:
Title:  Theriogenology     Volume:  -     ISSN:  1879-3231     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Inc. All rights reserved.
Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA.
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